Xcode is very slow when presenting a storyboard containing a title view inside a navigation item on an external monitor

Originator:jpmfagundes
Number:rdar://26154183 Date Originated:06-May-2016 11:56 PM
Status:Open Resolved:
Product:Developer Tools Product Version:7.3 (7D175)
Classification:Bug Reproducible:Always
 
Summary:
I've a got storyboard, this storyboard has a view controller which has a title view inside its navigation item. While showing such view controller on screen, Xcode becomes terribly slow if used in an external monitor. If you move to the Mac's main screen, it performs well again.

Steps to Reproduce:
1. Add view controller to a storyboard
2. Drag a Navigation Item to this storyboard
3. Drag a UIView to this Navigation Item
4. Drag anything else to this view, like a UIButton
4. Move Xcode to an external monitor
5. While the view controller previously created is on the screen, try navigation through the storyboard
Xcode now should be really slow and sluggish.
6. Move Xcode back to the Mac's main screen. Xcode should not be back at its old snappy self.

Expected Results:
Xcode's performance should not be affected by this specific scenario.

Actual Results:
Xcode's performance is seriously affected in this specific scenario.

Version:
Xcode 7.3 (7D175)
OS X 10.11.4 (15E65)

Notes:
I'm not using any 3rd party plugins

Configuration:
I'm using a MacBook Pro with Retina Display, Late 2013, 2.3GHz i7, NVIDIA GeForce GT 750M.
Tested in 3 different external monitors: a Thunderbolt Display and 2 generic LG monitors.

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